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DIGNOSIS OF CML
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Hi Caroline,
Without getting too technical, the PCR test was likely performed on your brothers blood, whereas the biopsy would have been on bone marrow.
These days blood tests are very accurate, but for the definitive genetic tests the bone marrow biopsy gives the irrefutable result. In most cases, and indeed in my own, the biopsy was taken to confirm what was already 99% expected.
David.